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			<h1>Java高级应用之通过反射访问操作数组</h1>
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			<div id="arc-body">在 java.lang.reflect 包下提供了一个 Array 类，Array 对象可以代表所有的数组。程序可以通过使用 Array 来动态地创建数组，操作数组元素等。<br>
<br>
Array 提供了如下几类方法。<br>
<ul>
	<li>
		static Object newInstance(Class&lt;?&gt; componentType, int…length)：创建一个具有指定的元素类型、指定维度的新数组。</li>
	<li>
		static xxx getXxx(Object array, int index)：返回 array 数组中第 index 个元素。其中 xxx 是各种基本数据类型，如果数组元素是引用类型，则该方法变为 get(Object array, int index)。</li>
	<li>
		static void setXxx(Object array, int index, xxx val)：将 array 数组中第 index 个元素的值设为 val。</li>
</ul>
<br>
其中 xxx 是各种基本数据类型，如果数组元素是引用类型，则该方法变成 set(Object array, int index, Object val)。<br>
<br>
下面程序示范了如何使用 Array 来生成数组，为指定数组元素赋值，并获取指定数组元素的方式。
<div class="snippet-container" style="undefined;"><div class="sh_bright snippet-wrap"><div class="snippet-menu sh_sourceCode" style="display: none;"><pre><a class="snippet-copy sh_url" href="http://c.biancheng.net/view/vip_7083.html#" style="display: none;">复制</a><a class="snippet-text sh_url" href="http://c.biancheng.net/view/vip_7083.html#">纯文本</a><a class="snippet-window sh_url" href="http://c.biancheng.net/view/vip_7083.html#">复制</a></pre></div><pre class="java sh_java snippet-formatted sh_sourceCode"><ol class="snippet-num"><li><span class="sh_keyword">public</span> <span class="sh_keyword">class</span><span class="sh_normal"> </span><span class="sh_classname">ArrayTest1</span> <span class="sh_cbracket">{</span></li><li>    <span class="sh_keyword">public</span> <span class="sh_keyword">static</span> <span class="sh_type">void</span> <span class="sh_function">main</span><span class="sh_symbol">(</span><span class="sh_usertype">String</span><span class="sh_normal"> </span>args<span class="sh_symbol">[])</span> <span class="sh_cbracket">{</span></li><li>        <span class="sh_keyword">try</span> <span class="sh_cbracket">{</span></li><li>            <span class="sh_comment">// 创建一个元素类型为String，长度为10的数组</span></li><li>            <span class="sh_usertype">Object</span><span class="sh_normal"> </span>arr <span class="sh_symbol">=</span> Array<span class="sh_symbol">.</span><span class="sh_function">newInstance</span><span class="sh_symbol">(</span>String<span class="sh_symbol">.</span><span class="sh_keyword">class</span><span class="sh_symbol">,</span> <span class="sh_number">10</span><span class="sh_symbol">);</span></li><li>            <span class="sh_comment">// 依次为arr数组中index为5、6的元素赋值</span></li><li>            Array<span class="sh_symbol">.</span><span class="sh_function">set</span><span class="sh_symbol">(</span>arr<span class="sh_symbol">,</span> <span class="sh_number">5</span><span class="sh_symbol">,</span> <span class="sh_string">"C语言中文网Java教程"</span><span class="sh_symbol">);</span></li><li>            Array<span class="sh_symbol">.</span><span class="sh_function">set</span><span class="sh_symbol">(</span>arr<span class="sh_symbol">,</span> <span class="sh_number">6</span><span class="sh_symbol">,</span> <span class="sh_string">"C语言中文网C语言教程"</span><span class="sh_symbol">);</span></li><li>            <span class="sh_comment">// 依次取出arr数组中index为5、6的元素的值</span></li><li>            <span class="sh_usertype">Object</span><span class="sh_normal"> </span>course1 <span class="sh_symbol">=</span> Array<span class="sh_symbol">.</span><span class="sh_function">get</span><span class="sh_symbol">(</span>arr<span class="sh_symbol">,</span> <span class="sh_number">5</span><span class="sh_symbol">);</span></li><li>            <span class="sh_usertype">Object</span><span class="sh_normal"> </span>course2 <span class="sh_symbol">=</span> Array<span class="sh_symbol">.</span><span class="sh_function">get</span><span class="sh_symbol">(</span>arr<span class="sh_symbol">,</span> <span class="sh_number">6</span><span class="sh_symbol">);</span></li><li>            <span class="sh_comment">// 输出arr数组中index为5、6的元素</span></li><li>            System<span class="sh_symbol">.</span>out<span class="sh_symbol">.</span><span class="sh_function">println</span><span class="sh_symbol">(</span>course1<span class="sh_symbol">);</span></li><li>            System<span class="sh_symbol">.</span>out<span class="sh_symbol">.</span><span class="sh_function">println</span><span class="sh_symbol">(</span>course2<span class="sh_symbol">);</span></li><li>        <span class="sh_cbracket">}</span> <span class="sh_keyword">catch</span> <span class="sh_symbol">(</span><span class="sh_usertype">Throwable</span><span class="sh_normal"> </span>e<span class="sh_symbol">)</span> <span class="sh_cbracket">{</span></li><li>            System<span class="sh_symbol">.</span>err<span class="sh_symbol">.</span><span class="sh_function">println</span><span class="sh_symbol">(</span>e<span class="sh_symbol">);</span></li><li>        <span class="sh_cbracket">}</span></li><li>    <span class="sh_cbracket">}</span></li><li><span class="sh_cbracket">}</span></li></ol></pre><pre class="snippet-textonly sh_sourceCode" style="display:none;">public class ArrayTest1 {
    public static void main(String args[]) {
        try {
            // 创建一个元素类型为String，长度为10的数组
            Object arr = Array.newInstance(String.class, 10);
            // 依次为arr数组中index为5、6的元素赋值
            Array.set(arr, 5, "C语言中文网Java教程");
            Array.set(arr, 6, "C语言中文网C语言教程");
            // 依次取出arr数组中index为5、6的元素的值
            Object course1 = Array.get(arr, 5);
            Object course2 = Array.get(arr, 6);
            // 输出arr数组中index为5、6的元素
            System.out.println(course1);
            System.out.println(course2);
        } catch (Throwable e) {
            System.err.println(e);
        }
    }
}</pre></div></div>
上面程序中第 5、7 和 8 行代码分别是通过 Array 创建数组，为数组元素设置值，访问数组元素的值的示例代码，程序通过使用 Array 就可以动态地创建并操作数组。<br>
<br>
下面程序比上面程序稍微复杂一点，下面程序使用 Array 类创建了一个三维数组。<br>
<div class="snippet-container" style="undefined;"><div class="sh_bright snippet-wrap"><div class="snippet-menu sh_sourceCode" style="display:none;"><pre><a class="snippet-copy sh_url" href="http://c.biancheng.net/view/vip_7083.html#" style="display: none;">复制</a><a class="snippet-text sh_url" href="http://c.biancheng.net/view/vip_7083.html#">纯文本</a><a class="snippet-window sh_url" href="http://c.biancheng.net/view/vip_7083.html#">复制</a></pre></div><pre class="java sh_java snippet-formatted sh_sourceCode"><ol class="snippet-num"><li><span class="sh_keyword">public</span> <span class="sh_keyword">class</span><span class="sh_normal"> </span><span class="sh_classname">ArrayTest2</span> <span class="sh_cbracket">{</span></li><li>    <span class="sh_keyword">public</span> <span class="sh_keyword">static</span> <span class="sh_type">void</span> <span class="sh_function">main</span><span class="sh_symbol">(</span><span class="sh_usertype">String</span><span class="sh_normal"> </span>args<span class="sh_symbol">[])</span> <span class="sh_cbracket">{</span></li><li>        <span class="sh_comment">/*</span></li><li><span class="sh_comment">         * 创建一个三维数组</span></li><li><span class="sh_comment">         * 三维数组也是一维数组，是数组元素是二维数组的一维数组，因此可以认为arr是长度为3的一维数组</span></li><li><span class="sh_comment">         */</span></li><li>        <span class="sh_usertype">Object</span><span class="sh_normal"> </span>arr <span class="sh_symbol">=</span> Array<span class="sh_symbol">.</span><span class="sh_function">newInstance</span><span class="sh_symbol">(</span>String<span class="sh_symbol">.</span><span class="sh_keyword">class</span><span class="sh_symbol">,</span> <span class="sh_number">3</span><span class="sh_symbol">,</span> <span class="sh_number">4</span><span class="sh_symbol">,</span> <span class="sh_number">10</span><span class="sh_symbol">);</span></li><li>        <span class="sh_comment">// 获取arr数组中index为2的元素，该元素应该是二维数组</span></li><li>        <span class="sh_usertype">Object</span><span class="sh_normal"> </span>arrObj <span class="sh_symbol">=</span> Array<span class="sh_symbol">.</span><span class="sh_function">get</span><span class="sh_symbol">(</span>arr<span class="sh_symbol">,</span> <span class="sh_number">2</span><span class="sh_symbol">);</span></li><li>        <span class="sh_comment">// 使用Array为二维数组的数组元素赋值，二维数组的数组元素是一维数组</span></li><li>        <span class="sh_comment">// 所以传入Array的set()方法的第三个参数是一维数组</span></li><li>        Array<span class="sh_symbol">.</span><span class="sh_function">set</span><span class="sh_symbol">(</span>arrObj<span class="sh_symbol">,</span> <span class="sh_number">2</span><span class="sh_symbol">,</span> <span class="sh_keyword">new</span> String<span class="sh_symbol">[]</span> <span class="sh_cbracket">{</span> <span class="sh_string">"C语言中文网Java教程"</span><span class="sh_symbol">,</span> <span class="sh_string">"C语言中文网C语言教程"</span> <span class="sh_cbracket">}</span><span class="sh_symbol">);</span></li><li>        <span class="sh_comment">// 获取arrObj数组中index为3的元素，该元素应该是一维数组</span></li><li>        <span class="sh_usertype">Object</span><span class="sh_normal"> </span>anArr <span class="sh_symbol">=</span> Array<span class="sh_symbol">.</span><span class="sh_function">get</span><span class="sh_symbol">(</span>arrObj<span class="sh_symbol">,</span> <span class="sh_number">3</span><span class="sh_symbol">);</span></li><li>        Array<span class="sh_symbol">.</span><span class="sh_function">set</span><span class="sh_symbol">(</span>anArr<span class="sh_symbol">,</span> <span class="sh_number">8</span><span class="sh_symbol">,</span> <span class="sh_string">"C语言中文网Python教程"</span><span class="sh_symbol">);</span></li><li>        <span class="sh_comment">// 将arr强制类型转换为三维数组</span></li><li>        String<span class="sh_symbol">[][][]</span> cast <span class="sh_symbol">=</span> <span class="sh_symbol">(</span>String<span class="sh_symbol">[][][])</span> arr<span class="sh_symbol">;</span></li><li>        <span class="sh_comment">// 获取cast三维数组中指定元素的值</span></li><li>        System<span class="sh_symbol">.</span>out<span class="sh_symbol">.</span><span class="sh_function">println</span><span class="sh_symbol">(</span>cast<span class="sh_symbol">[</span><span class="sh_number">2</span><span class="sh_symbol">][</span><span class="sh_number">3</span><span class="sh_symbol">][</span><span class="sh_number">8</span><span class="sh_symbol">]);</span></li><li>        System<span class="sh_symbol">.</span>out<span class="sh_symbol">.</span><span class="sh_function">println</span><span class="sh_symbol">(</span>cast<span class="sh_symbol">[</span><span class="sh_number">2</span><span class="sh_symbol">][</span><span class="sh_number">2</span><span class="sh_symbol">][</span><span class="sh_number">0</span><span class="sh_symbol">]);</span></li><li>        System<span class="sh_symbol">.</span>out<span class="sh_symbol">.</span><span class="sh_function">println</span><span class="sh_symbol">(</span>cast<span class="sh_symbol">[</span><span class="sh_number">2</span><span class="sh_symbol">][</span><span class="sh_number">2</span><span class="sh_symbol">][</span><span class="sh_number">1</span><span class="sh_symbol">]);</span></li><li>    <span class="sh_cbracket">}</span></li><li><span class="sh_cbracket">}</span></li></ol></pre><pre class="snippet-textonly sh_sourceCode" style="display:none;">public class ArrayTest2 {
    public static void main(String args[]) {
        /*
         * 创建一个三维数组
         * 三维数组也是一维数组，是数组元素是二维数组的一维数组，因此可以认为arr是长度为3的一维数组
         */
        Object arr = Array.newInstance(String.class, 3, 4, 10);
        // 获取arr数组中index为2的元素，该元素应该是二维数组
        Object arrObj = Array.get(arr, 2);
        // 使用Array为二维数组的数组元素赋值，二维数组的数组元素是一维数组
        // 所以传入Array的set()方法的第三个参数是一维数组
        Array.set(arrObj, 2, new String[] { "C语言中文网Java教程", "C语言中文网C语言教程" });
        // 获取arrObj数组中index为3的元素，该元素应该是一维数组
        Object anArr = Array.get(arrObj, 3);
        Array.set(anArr, 8, "C语言中文网Python教程");
        // 将arr强制类型转换为三维数组
        String[][][] cast = (String[][][]) arr;
        // 获取cast三维数组中指定元素的值
        System.out.println(cast[2][3][8]);
        System.out.println(cast[2][2][0]);
        System.out.println(cast[2][2][1]);
    }
}</pre></div></div>
上面程序的第 7 行代码使用 Array 创建了一个三维数组，程序中较难理解的地方是第 12 行代码，使用 Array 为 arrObj 的指定元素赋值，相当于为二维数组的元素赋值。由于二维数组的元素是一维数组，所以程序传入的参数是一个一维数组对象。<br>
<br>
运行上面程序，结果如下：
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从运行结果可以看到 cast[2][3][8]、cast[2][2][0]、cast[2][2][1] 元素都有值，这些值就是刚才程序通过反射传入的数组元素值。</div>
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